The AWI in Bremerhaven, Germany, conducts multidisciplinary Earth system and climate research and coordinates the German Polar Research Program. Past and future environmental changes are addressed from a marine and polar perspective. AWI’s contribution to AtlantOS is provided by two groups: The HGF MPG Joint Research Group for Deep-Sea Ecology and Technology combines expertise in biological oceanography and technology available at AWI and the Max Planck Institute for Marine Microbiology. The ecology of polar ecosystems is studied with state of the art methods and advanced in situ instruments, focusing on global change effects on biodiversity and element cycling. Fixed point observatories, ROV and AUV payload, and sampling campaigns are combined for ecosystem observations at the HAUSGARTEN deep-sea observatory west of Svalbard. The Section Observational Oceanography uses an array of moorings across Fram Strait, state of the art instrument platforms (gliders, buoys, profilers), and modelling tools to investigate dynamics and global change related trends of physical processes in the subpolar and polar ocean. AWI will co-lead WP3 and contribute to tasks 3.0 ‘WP3 coordination’, 3.2 ‘Ocean-Sites biogeochemistry, 3.3 ‘Ocean-Sites transport’, 6.1 ‘Sensors and new instrumentation’, 6.2 ‘Common metrology and best practices ’, and 6.5 ‘Supporting new and emerging networks’. Observations, knowledge and best practice analyses for integrating ocean variables and for implementing new technologies will be provided towards holistic, multidisciplinary observation of the Atlantic and its bordering polar regions.